/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package javax.el;

/**
 *
 */
public abstract class MethodExpression extends Expression {

	private static final long serialVersionUID = 8163925562047324656L;

	/**
	 * @param context The EL context for this evaluation
	 * @return Information about the method that this expression resolves to
	 * @throws NullPointerException      If the supplied context is <code>null</code>
	 * @throws PropertyNotFoundException If a property/variable resolution failed because no match
	 *                                   was found or a match was found but was not readable
	 * @throws MethodNotFoundException   If no matching method can be found
	 * @throws ELException               Wraps any exception throw whilst resolving the property
	 */
	public abstract MethodInfo getMethodInfo(ELContext context) throws NullPointerException, PropertyNotFoundException, MethodNotFoundException, ELException;

	/**
	 * @param context The EL context for this evaluation
	 * @param params  The parameters with which to invoke this method expression
	 * @return The result of invoking this method expression
	 * @throws NullPointerException      If the supplied context is <code>null</code>
	 * @throws PropertyNotFoundException If a property/variable resolution failed because no match
	 *                                   was found or a match was found but was not readable
	 * @throws MethodNotFoundException   If no matching method can be found
	 * @throws ELException               Wraps any exception throw whilst resolving the property or
	 *                                   coercion of the result to the expected return type fails
	 */
	public abstract Object invoke(ELContext context, Object[] params) throws NullPointerException, PropertyNotFoundException, MethodNotFoundException, ELException;

	/**
	 * @since EL 2.2
	 * <p>
	 * Note: The spelling mistake is deliberate.
	 * isParmetersProvided()  - Specification definition
	 * isParametersProvided() - Corrected spelling
	 */
	public boolean isParmetersProvided() {
		// Expected to be over-ridden by implementation
		return false;
	}
}
